/// <summary>
/// Generate label categories for the given set of shapefile categories
/// </summary>
/// <param name="mapWin">The reference to MapWindow</param>
/// <param name="layerHandle">The handle of the layer</param>
internal static void GenerateCategories(LegendControl.Legend legend, int layerHandle)
{
Layer lyr = legend.GetLayer(layerHandle);
Shapefile sf = lyr.GetObject() as MapWinGIS.Shapefile;
Labels lb = sf.Labels;
sf.Labels.ClearCategories();
for (int i = 0; i < sf.Categories.Count; i++)
{
ShapefileCategory cat = sf.Categories.get_Item(i);
LabelCategory labelCat = lb.AddCategory(cat.Name);
labelCat.Expression = cat.Expression;
}
SymbologySettings settings = Globals.get_LayerSettings(layerHandle);
ColorBlend blend = (ColorBlend)settings.LabelsScheme;
if (blend != null)
{
ColorScheme scheme = ColorSchemes.ColorBlend2ColorScheme(blend);
if (settings.LabelsRandomColors)
{
lb.ApplyColorScheme(tkColorSchemeType.ctSchemeRandom, scheme);
}
else
{
lb.ApplyColorScheme(tkColorSchemeType.ctSchemeGraduated, scheme);
}
}
if (settings.LabelsVariableSize)
{
for (int i = 0; i < lb.NumCategories; i++)
{
lb.get_Category(i).FontSize = (int)((double)sf.Labels.FontSize +
(double)settings.LabelsSizeRange / ((double)lb.NumCategories - 1) * (double)i);
}
}
// Expressions aren't supported by labels yet, therefore we need to copy indices from the symbology
for (int i = 0; i < lb.Count; i++)
{
MapWinGIS.Label label = lb.get_Label(i, 0);
label.Category = sf.get_ShapeCategory(i);
}
}
/// <summary>
/// Generates labels with specified positions
/// </summary>
private void btnOk_Click(object sender, EventArgs e)
{
// callback and wait cursor
ICallback cBackOld = m_shapefile.GlobalCallback;
Callback cback = new Callback();
m_shapefile.GlobalCallback = cback;
this.Enabled = false;
this.Cursor = Cursors.WaitCursor;
MapWinGIS.Labels lb = m_shapefile.Labels;
tkLabelPositioning positioning = get_LabelPositioning();
lb.LineOrientation = (tkLineLabelOrientation)cboLineOrientation.SelectedIndex;
try
{
// generation
m_shapefile.GenerateLabels(-1, positioning, !chkLabelEveryPart.Checked);
m_shapefile.Labels.SavingMode = tkSavingMode.modeXMLOverwrite; // .lbl file should be updated
ShpfileType type = Globals.ShapefileType2D(m_shapefile.ShapefileType);
if (type == ShpfileType.SHP_POINT || type == ShpfileType.SHP_MULTIPOINT)
{
if (optAlignBottomCenter.Checked)
{
m_alignment = tkLabelAlignment.laBottomCenter;
}
if (optAlignBottomLeft.Checked)
{
m_alignment = tkLabelAlignment.laBottomLeft;
}
if (optAlignBottomRight.Checked)
{
m_alignment = tkLabelAlignment.laBottomRight;
}
if (optAlignCenter.Checked)
{
m_alignment = tkLabelAlignment.laCenter;
}
if (optAlignCenterLeft.Checked)
{
m_alignment = tkLabelAlignment.laCenterLeft;
}
if (optAlignCenterRight.Checked)
{
m_alignment = tkLabelAlignment.laCenterRight;
}
if (optAlignTopCenter.Checked)
{
m_alignment = tkLabelAlignment.laTopCenter;
}
if (optAlignTopLeft.Checked)
{
m_alignment = tkLabelAlignment.laTopLeft;
}
if (optAlignTopRight.Checked)
{
m_alignment = tkLabelAlignment.laTopRight;
}
}
// updating references to categories
if (lb.NumCategories > 0)
{
for (int i = 0; i < lb.Count; i++)
{
MapWinGIS.Label label = lb.get_Label(i, 0);
label.Category = m_shapefile.get_ShapeCategory(i);
}
}
}
finally
{
this.Enabled = true;
this.Cursor = Cursors.Default;
cback.Clear();
m_shapefile.GlobalCallback = cBackOld;
}
}
